From: jfvschra AT eduserv1 DOT rug DOT ac DOT be (Johan Verschraegen)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Allegro program won't work
Date: 10 Apr 1999 19:40:58 GMT
Organization: University of Ghent, Belgium
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: >   screenx1=160.0+256.0*( x[i] / z);           // This algorithm
: >   screeny1=100.0+256.0*( y[i] / z);           // calculate where

If you zoom in to close you divide by zero.
Maybe that's your problem.

johan